Chuck



May 12,` 1936. F. WALTHER CHUCK- Filed sept. 17,'1934 2 Patented May 12, v 1936 CHUCK Fritz Walther, Plauen in Vogtland, Germany, as-

signor to VomagiBetriebs-A. G., Plauen in r Vogtland, Germany Application September 17, 1934, Serial No. 744,458

. Germany July 4, 1932 3 Claims.

In boring machines for iine work, it is known toy employ a two-part boring bar, the one part of which, to which the tool is attachedfbeing` hinged to the other part so that the'worked surl5 face of the `work-piece is prevented from being damaged when the work-piece is withdrawn from the tool or this is withdrawn from the work-piece. In the known boring devices the tool carrier is `a spindle held between centres and a sleeve is provided which partly surrounds one of the centres and the tool carrier and has a feather that engages a corresponding groove of the tool holder in order to carry the latter around with it. This device has the disadvantages that in order toA 16 disconnect the parts concerned, the v boring spindle must always be brought into a certain denite position, also the position of the ytool is not maintained sufliciently accurately owing to its being clamped between centreslf l 20 The above-mentioned disadvantages are obviated in my improved chuck forming the subject matter of the present invention. I attain the 4 object in view by providing one of the two parts of the boring rod with an annular projection and the other part with a correspondingly shaped groove, said projection engaging said groove similar to feather and groove, but the shape of these parts being such that they are centered with respect to one another, and there is. furthermore, provided a clamping sleeve which surrounds vthe interengaging .parts and connects them rigidly with one another when it has been screwed tight, while it permits turning the toolcarrying part about the hinge relatively to the, 85 other part when said sleeve has been loosened' and unscrewed. By designing the chuck in this manner I attain at the same time `the further advantage that the boring rod can be used in overhung position whereby the ilxing of the tool 4o is considerably simpuned.

The invention is illustrated diagrammatically and by way of example on the accompanying drawing in which Figure 1 shows an axial section of a chuck designed according to this invention. Fig. 2 shows a part of Fig. 1 on a larger scale.

Fig. 3 shows the adjacent ends of the two parts ofthe boring rod to be connected by a hinge -partly in section. f

Fig. 4 is an end view of Fig. 3 seen from the 60 left-handside, .and\

Fig. 5 is a plan of Fig. 3, the'two parts of the boring rod being in engagement with each other.

In the drawing, I denotes the boring spindle which is driven byy any suitable means, and has 65 in its free end a slightly conical bore into which is inserted a correspondingly conical pivot 2. Y The free end of the spindle I is, furthermore, provided with an exteriorthread 9 onto which is screwed ailarge nut 8 combined with a handwheel 8. The nut portion located in front of 5 said hand-,wheel (right hand from the same inthe ligure) is likewise provided with an exterior thread 8b and an interiorly threaded cap 1 is screwed upon said thread 8b and can be secured in its position thereon by a set-screwflb. The 10 cap 1 has at its free riml an inwardly directed ange 'Ilwhich bears on an intermediate ring'i3 inserted between said iiange andan enlarged portion v5 of the tool holder I2 to which is attached the tool I2u which, in the ,exampleshowm is pro- 15 vided with diamonds I2". lIn' the portion 5 of the tool holder is an annular groove 6 of prismatic transverse section, and opposite said portion 5 is a disklike\enlargement 3 of the pivot 2; this enlargement has an annular rib 4 with conical 20 surfaces fitting the complementar-ily formed surfaces of the groove 6 for centering the two parts 3 and 5, or 2 and I2 when thencap 'I is screwed home on the nut 8, the iiange 'Il of the cap then pressing the intermediate ring I3 onto the por- 25 tion 5 of the tool holder I2. The disk 3 and the tool holder 5, I2 are connected with one another by a hinge II, having an I-like form; the two parallel legs of the hinge engage semi-circular grooves 3n and I2a .of the disk 3 and the tool- 30 I holder I2, respectively, and the'middle leg lies within a groove 3b and I 2b of the two mentioned parts. Dlametrically opposite the hinge is provided a helical compressive spring I 0 which lies in a recess I Il'L in the part I2 and tends to turn the '35 tool holder on said hinge and turns it away from the disk when the-nut -il is turned in counterclockwise direction by means of the handwheel 8*.

. 1 wish 1t to be understood that-1' do not limit 4o Y. `myself to the constructional form shown in the drawing merely by way of example. Various departures inthe details are possible Without departing from the invention.

I claimbv 1. A chuck comprising a driving member, a two-part boring rod comprising a part to be attached to the driving member and a part to which a tool is to be attached, an annular tapered rib on one of said parts engaging a complimentarily v shaped groove in the other of said two parts, said. j

.rib and groove being concentrically disposed with respect to the axis of the chuck and the boring rod, a hinge connecting said parts with one another in such a manner that the part carrying the tool is movable transversely to the longitudinal axis of the boring rod, and means engaging the driving member for pressing the two boring rod parts against one another and alsa/securingl them to the driving member.

2. A chuck comprising a driving member, a. two-part boring rod comprising a part to be attached to the driving member` and a part to which a tool is to be attached, an annular'tapered rib on one of said parts engaging a complimentarily shaped groove in the other of said two parts, said rib and groove being concentrically disposed with respect to the axis of the chuck and the Yboring rod, a hinge connecting these parts with o ne another in such a manner that the part carrying the tool is movable transversely to the longitudinal axis of the boring rod, a nut screwed upon the driving member of the chuck, and a cap screwed upon said nut and having a ange over- 4rib and groove being concentrically disposed with respect to the axis of the chuck and the boring rod, a hinge connecting these two parts with one another in such a manner that the part carrying the tool is movable transversely to the longitudinal axis of the boring rod, a compressive spring arranged between said parts at a. place diametrically opposite to said hinge, and means engaging the driving member for pressing the two boring rod parts against on'e another and also securing them to the driving member.

' FRITZ WALTHER. 

